Grinding machine



L; A. CASGRAIN.

GRINDING MACHINE. APPLICATION FILED MAY 28, 1919.

Patented Mar. 28, 1922.

LOUIS A. oasenanv, on BEVERLY, MASSACHUSETTS, ASSIGNOR T UNITED SHOE iviAomnnnY CORPORATION, on ra'rnnson, NEW JERSEY, a CORPORATION on NEW JERSEY.

GRINDING MACHINE.

Patented Mar. 28, 1922.

Gontinuation of application lilo. 143,707, filed January 22, 1917, of parts common to both applications.

' This application filed May 28, 1919. Serial No. 300,255.

r the accompanying drawings, is a specificw tion, like reference characters on the drawings indicating like parts in the several figures.

This invention relates to grinding inachines and more particularly to a machine designed for grinding curved blades having curved edges. The present application is a continuation of application for United States Letters Patent Serial No. 143,707,

filed January 22, 1917, as to all subject-matter that is common to the tWo applications.

In a machine for grinding knife blades of the type specified it is important that the blade shall be so supported with relation to the grinding wheel that the exact bevel. and shape of edge desired may be obtained. To this end the general object of this invention is to provide a simple construction of grinding. machine adapted for grinding blades with curved edges and so arranged that a blade ma be manually moved in a definite path relatively to the grinding wheel.

As a feature of the invention 1 provide a plurality of extended rests over which a blade may be moved in grinding and the edge thereof maintained at a definite bevel.

Another feature of the invention consists in novel means for determining the form of the edge of the blade, this means including a templet fixed to the blade and a guide for co-operation with the templet.

In the embodiment of my invention exemplified herein I employ a clamp or carrier for holding a teniplet and the blade to be ground in proper relation to each other to ensure accurate grinding of the blade. A further feature of my present invention resides in the provision of a gage carried by V the clamp, said gage being constructed and arranged to determine the proper position of the blade and the templet relatively to each other and to the body of the clamp or holder.

@ther features of the invention will appear from a consideration of the appended claims in connection with the following specification and the accompanying drawings illustrating apreferred embodiment thereof, in which, i

Fig. l is a perspective view of so much of my novel grinding machine as is necessary to an understanding of my invention;

Fig. is a side view of the blade guiding mechanism showingv a blade and templet and the clamp thereof in section; and

Fig. 3 is a perspective View of one form of clamping device and gage for holding the templet in' the desired relation to a blade to be ground.

Journaled in the base 10 is a shaft carrying a grinding wheel 14 which is partially covered in the customary manner by means of a guard 16, one portion 18 of which is pivoted to permit access to the wheel. Fixed and loose pulleys 20 provide means for driving the shaft and wheel. A suitable water receptacle is usually provided to supply water to the wheel by means of a flexible tube 26. A pan 30 is provided beneath the wheel to catch the drippings. This pan may be mounted adjustably with relation to the base by means of a dove-tail groove 32 co-operating with a similarly shaped projection on the pan and may be adjusted by means of a hand screw 34 threaded in a lug 36 upon the base.

Secured to this water pan is a bracket 40 which acts as a support for an arm 42 pivotally attached thereto. A spring la attached to a projection on the bracket 40 and to the arm 42 serves to hold the latter with its attached parts in operative position (as shown) against the hub of the casing 16 or in inoperative position against the pan 30 when it is desired to use the grinding wheel without a guide. The arm i2 is designed with a horizontal portion 43 which enables adjustment thereof, with the water pan, without changing the height of the arm relative to the grindingwheel. Carried upon the arm 42 is a curved guide 46 which is held in comparatively close relation to the grind ing wheel and is adapted to act as a rest or support for the upper end of the blade to be ground. This guide is given a curvature which approximates but is preferably sharper than the curvature of the blades to be ground. A rest 48 is provided, for supporting and guiding the lower end of the blade. which rest comprises a curved rod whose lateral arms extend through lugs 50 upon the arms 42 and are adjustably positioned therein by means of set screws 52. The guide l6 and rest 48 therefore constitute two points of support for the knife blade and by proper adjustment of the rest 48 the bevel at which the knife edge will be ground may be exactly determined. Adjustment of the support 40 by manipulation of the screw 34 enables compensation for the varying size of the grinding wheel as the latter wears awa during use.

A templet 54 is provided which preferably has a cross-sectional contour corre sponding to that of the blate to be ground. This t-emplet may conveniently be termed of an old knife blade and will be ground so that its forward end has a shape corresponding to the desired curvature of the edge oi? the blade. This templet 54: is intended to be clamped upon the outside of the tnit'e blade 56 by means of a clamp 58. Qne construction oi: such a clamp 1s illustratedin Fig. 5) and will be seen to comprise two pivctally joined clamping members with hooked ends, one of these members being provided with a tapped extension 60 adapted to receive a thumb'screw 62 for forcing the hooked end into engagement with the lateral edges of both the templet and the knife blade. Ears '76 upon the clamp members 58 serve to contact with the outer sides oi the be Formed integrally with the guide r-obut obviously su h a construction not essential. lviovement oi the bracket {56 relative to tie extension is limited by means of bolts 72 passing through ears on the bracket and on the extension 70 in order to t. cilitate the insertion of a blade for grinding. A spring 74 joined to the extension 70 and the bracket 66 and tends to move the templet guide 64 toward the guide ib and the rest 48 at a point between these guides.

- adjusted to bring the blade in contact with the grinding wheel by manipulation of the screw 3st. The rotatable templet guide 6- will. then bear upon the outer face of the knife blade and form an abutment a inst which the edge of the templet may be pressed thereby to guide the blade so that its edgewill be ground with the desired curvature. This guide 6e will also serve to hold the blade against the guide rests i6 and its theblade is movedby and over the guide i6 and the rest id, lateral movement of the blade may conveniently be limited by the engagement of ears '76 or clamp 58, with the outer sides of the guide 46, to insure that it shall not be moved past the edge ot the grirnling wheel.

its best-shown in Fig. 3 one of the members oi? the clan?) 338 has hubs 78 and the other member has a hub 80. These three hubs are in alinement and are mounted upon a tubular pivot sleeve 82. Rotatively and longitudinally shittable in the sleeve 82 is the shank 84 ot' the gage device. one end of said shank having a head 86 formed or provided with two shoulders 88-41% At the other end of the shank is a stop 92- which is preferably adjustable relatively to the shank. Said stop may consist of the head of a screw tapped into the end of the shank 84-.

The object of this is to locatethe templet and kniie' in proper relation to each other and to the clamp. he two shoulders 88-90 are spaced so that when the templet 54: bears against the shoulder 90 and the knife blade 56 bears against the shoulder 88, the said templet and knife blade will be so related that when said gage has been shifted out of the way to the position indicated in Fig. 2 and the edge of the templet 54 caused to bear against the guide 64; the edge of the knife blade will then be in proper position to be accurately ground.

The object of the stop 92 to enable the templet and blade to be properly positioned in the clamp. L. it be assumed that the thumb screw 62 is loosened sufficiently to enable the templ-et and blade to be shiftedlongitudinally relatively to the clamp members. and ii the gage is then shitted lengthwise until the stop 92 contacts with the end of the sleeve 82 or hub oi the clamp the gage head 86 will then be at the proper distance longitudinally or the clamp to PlOVlClB for the proper relative locations of? the templet and blade in the manner above described.

Having described my invention, what 1 claim as new and desire to secure by Letters Patent ot the United States is:

1. In a grinding machine, a grinding wheel, a plurality 0t extended rests for a knife whose edge is to be ground, said rests so located with respect to the grinding wheel to constitute guides eve which may be moved separated points of the knife to be ground and which determine the bevel at which. the edge will be ground; and means for determining the extent of approach oi the blade towards the grinding wheel in its movement over the guides to impart the de; sired shape to the cutting edge.

2. In a grinding machine for grinding curved blades, a grinding wheel, a curved guide crossing the periphery of the grinding wheel to serve as a support for the'blade near its cutting edge, another guide more remote from the grinding wheel and adapted to be associated with a difierent portion of the blade, means for adjusting the latter guide to thereby determine the bevel at which the knife will be ground, and means for controlling the movement of the blade towards or from the periphery of the wheel as the blade is moved along the guides.

3. In a grinding machine, a grinding wheel, a support adjustably mounted relatively to said grinding wheel, a plurality of guides mounted on said support to co-operate with longitudinally separated points of a knife blade, one of said guides being adjustable relatively to the other guide thereby to determine the bevel at which the knife will be ground.

4:. In a grinding machine, a guide rest serving as a support to position a blade relative to the grinding wheel, a templet mechanically connected to said blade, and a rotatable templet guide associated with said templet to thereby determine the shape of the edge of the blade.

5. In a blade grinding machine, a grinding wheel, spaced blade supporting members associated therewith, a templet having a cross-sectional contour like the cross-sectional contour of the blade to be ground, means for clamping said templet to said blade, and a templet guide resiliently urged against said blade between said points of support and adapted to co-operate with the edge of said templet to determine the move ment of the blade toward and away from the grinding wheel to thereby determine the shape of the edge of the blade.

6. In a blade grinding machine, in combination, a grinding wheel, blade guiding means mounted adjacent the periphery of the wheel, a templet constructed and arranged for clamping engagement with a blade to be ground, a support for the blade guiding means, and a templet guide pivoted to the support.

7. In a grinding machine, a grinding wheel, a support, a guide mounted on said support and positioned relatively close to said grinding wheel, a second guide adjustably mounted on said support and adapted to be positioned at a point more remote from said grinding wheel, and a templet guide pivotally mounted upon the support and spring-pressed toward said first mentioned guides in a position betweenthe same.

8. In a blade grinding machine, a grinding wheel, a guide mounted adjacent said grinding wheel, an edge templet adapted to be clamped to the upper surface of a blade to be ground, and a rotatable templet guide pivotally mounted adjacent said blade guide and spring-pressed toward the same to bear against the upper surface of the blade and the edge of the templet.

9. In a blade grinding machine, a grinding wheel, a guide, a templet, and a clamp constructed and arranged to hold the templet and a blade to be ground in operative relation and to cooperate with said guide to limit the movement of the blade relatively to the grinding wheel, said clamp comprising two pivotally oined members having hooked ends to engage the edges of the templet and blade, and means for adjusting said members relatively to each other to vary the distance between their hooked portions.

10. In a blade grinding machine, in combination, an abrading member, a templet, a templet guide, a clamp for securing the templet to the blade to be ground, and a gage member connected to the clamp and having means to locate the edge of the blade in such relation to the templet that the blade will engage the abrading member when the templet engages the guide.

11. In a blade grinding machine, in combination, an abrading member, a templet, a

'templet guide, and a gage member having shoulders for engaging the edges of the blade and the templet to locate the blade for grinding.

12. A work and templet holding clamp for grinding machines comprising two hook members pivotally connected together and having a gage member constructed and arranged to define the operative positions of the work and templet relatively to each other and to the clamp.

13. A work and templet holding clamp for grinding machines comprising two members having marginal portions shaped to engage edge portions of the work and templet, a tubular pivot connecting said members together, means for adjusting the angular relationship of said members, and a gage member mounted in said tubular pivot.

let. A work and templet holding clamp for grinding machines comprising two members having marginal portions shaped to engage edge portions of the work and templet, a. tubular pivot connecting said members together, means for adjusting the angular relationship of said members, and a gage member having a shank longitudinally movable in said tubular pivot and having shoulders to define the operative positions of the work and templet.

15. A knife grinding machine having, in combination, a grinding wheel, a clamp comprising two hook members, a tubular pivot connecting said members, means for adjusting the angular relationship of said members, and a gage comprising a shank mounted in said tubular pivot and having a stop at one end and means at the other end for defining the position of a knife to be ground.

16. A knife grinding machine having in combination, a grinding wheel, a clamp comprising two hook members, av tubular pivot connecting said members, means for adjusting the angular relationship of said members, and a gage comprising a shank mounted in said tubular pivot and having an adjustable stop at one end and a head at the other end provided With shoulders to engage the edges of a templet and a knife 10 tobe ground. 7

In testimony whereof I have signed my name to this specification.

LOUIS A. GASGRAIN. 

